Grinding-wheel.



PATEETED JULY 10, 1906.

a HART. emmnw WHEEL. APPLICIATIG! FILED 107.3. 1905.

Zia/6151 01 ZV/Q PATENT OFFICE.

GILBERT HART, OF DETROIT. MICHIGAN.

GRINDING-WHEEL.

Specification of Letters Patent.

Patented July 10, 1908.

Application filed November 3;].805. Serial No. 285.778.

To alt? whom/it may concern:

Be it known that l, GILBERT I'IART, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigen, have invented new and useful Im rovements in Grinding-Wheels, of which t e fol lowing is a specification.

This invention relates to grinding-wheels and also to a method of making the same,

A grinding-wheel involving my invention has removable and renewable peripheral segments-such, for example, as is shown in Lettors Patent No. 779,848, granted to me Janua 10, 1905, to which re he primary ob'ect of the resent invention is to secure t e union grinding-segments; which are usually made from emery, to metal segments which carry them in such sway that the former cannot be cracked or broken during baking. 7

In the drawings accompanyin and forminga. part of this specification, are 1 is a face new of a grinding-wheel inc uding my inventi n with a part of the wheel in section to better illustrate the invention. Fig. 2 is a central sectional elevation of the same. Fig. 3 is a detail view of a metal segment. Fig. 4 is a similar View of an emery or grinding segment.

Like characters refer to out the views.

The s ider for the wheel shown in the drawings is enoted by 2, end it may be made by casting, it having a wide periphery or rim, as 3 upon which are imposed the segments 4. The segments may be connected tothe rim in the manner shown inthe Letters Patent herelike parts throughinbefore referred to or in any other desirable we; The segments are arranged in end-toen abutting relation upon the rim or periphmade integral with the metallic segments or plates 4. I find that if I mold the emery segments 5 directlg onto the metallic plates or segments 4 wit out the interposition of any suitable substance between the pins 6 and the said emery segments the latter will when erence may belied.

baked be cracked by the anchoring ins, owingto the fact that the coefficient 0 expension of the emery is different from that of the metal. I overcome this objection in an advantageous way, as will now appear.

In shaping up the segments 5 I form in them 0 enings to receive the nnchoringpins 6, the isrneter of the openings being greater than that of the pins and the solder 7 filling the spaces between the pins and the walls of the openings in which they are introduced.

After each eme segment 5 is molded or formed to the desired she c it is baked or vitrified, following which t e metallic plate or segment 4 is fitted to the emo ing segment and the two parts 0 am ed together. The composite segment is t on set on edge and solder or cement in a fluid condition is poured through the small 0 enings 8 in one ed eof the emery segment. ings or else 8 intersect the pin-receiving openings in the emery segments. To vent leakage of the cement or solder I p ace clay or putty on the two ends of t e composite segment and the side of said compels ts segment opposite the entering ends of the holes or openings 8, the clay or putty covering the joint between the metal and emery seg merits.

The solder or cement may be of any desirable kind, although I have found sulfur or brimstone a satisfactory medium. The metal plates may be of any desirable kind. Ordinarily' they are made of malleable iron having integral pins 6, the pins being headed or upset by the blow of a hammer. The heads formed by the hammer or other implement prevent the pins from bein pulled from piece; The sulfur is poured into the open- 8 while in a molten condition. aving thus described my invention, what or grindmeet the plate and segment the diameter of the pins being greater than that of the open-v ings, the solder surrounding the pins.

3. As an artieleof manufacture, a grinding 5 segment having pin-receiving openmgs, and

Fmrmg -0pe111ngs extending into the same mm a side edge and interseetmg the other openings. i

In testirnony whereof I have hereunto set GILBERT HART Witnesses:

MICHAEL H. DEMPSEY. THOMAS V. DUTTON. 

